693 
fourteen large rounded radiate riba ; each with two rather shallow radiate grooves and 
transversely striate, striae at the marginal end becoming scaly raised imbrications, eight 
to ten in number ; interstices furnished with two or three conspicuous granular ribs ; 
umbone very acute ; Long. GO, Lat. 50, thickness of two valves 30 milHm. {Ten. Woods.) 
Ohs. This shell is said by its describer to have relations with Pecten asper, of 
South Australia, the common Australian P.bifrons, and P. radwla, Linn., from the 
Philippine Islands, but to be distinct from all. 
Loo. and Horizon. Tulc Island {The late Sir W. Macleap Macleay Museum, 
University of Sydney) — Lower Pliocene ? 
Order— YENEKACEA. 
Pamily — OTEENID.®. 
Genus—GTBENA, Lamarolc, 1806. 
(Ann. Mus. Hist. Nat. Paris, vii.) 
Cteena nitida, BesJiayes. 
Cyrena nitida, Deshayea, Proc. Zool. Soc., 1854, p. 23. 
„ „ Canefri, Ann. Mus. Civ. Storia Nat. Genova, 1883, xix., p. 286. 
Ohs. This species is reported from the Aru Islands, by Canefri ; and he quotes 
New Guinea, on the authority of Beccari. 
Loc. and Horizon. Aird Hills, Douglas Eiver, British New Guinea. This 
species, with Melania clavus, Lamarck, and Ncritina gagates, Lamarck, was collected by 
Mr. T. P. Bevan during his Pifth Exploring Expedition to British New Guinea. Ue 
says— “The term Aird Hihs describes an island of probably moderately recent 
upheaval, on which a cluster of volcanic cones, some ten in number, and covering an 
area of about five square miles, are surrounded by deep navigable channels ot tresh 
water. The country for thirty miles to the south, and for some ten miles to the north, 
is chiefly of low-lying alluvial formation. The general form of these trachyte hflls is a 
volcanic cone. The summit of this particular cone, however, is covered with a deposit 
of semi-fossiHsed fluviatile shells, contained in an earthy mould or silty mud. 
Class — Gasteropoda. 
Order-PECTINIBRANCHIATA. 
Pamily — MEL AN YDM. 
Genus— -MHLAHIA, Lamarolc, 1801. 
(Syst. Anim. sans Verteb., p. 91.) 
Melasia clavus, Lamarolc. 
““ P. 17», t 21, f. 17 ^ 
oL. Mr. J. Brazier inlorma me that tliiz speciea has been met with m the 
Solomon Islands, but not before in New Guinea. 
Loc. and Horizon. With the preceding. 
* Mr. T. P. Bevan’s Pifth Expedition to British New Guinea, 1888, pp. 21-22 (8yo. : Sydney : 
by Authority : 1888). 
